Podcast
Questions and Answers
On which network is Computer 2 with IP address 10.1.1.205?
On which network is Computer 2 with IP address 10.1.1.205?
NOT Network C
For what purpose would Computer 1 send a FF:FF:FF:FF:FF broadcast ARP message to all nodes on Network A?
For what purpose would Computer 1 send a FF:FF:FF:FF:FF broadcast ARP message to all nodes on Network A?
NOT: To obtain Computer 2 MAC address
Which layer constructs the Ethernet frame?
Which layer constructs the Ethernet frame?
Data Link Layer
What information is in the data payload for the IP datagram?
What information is in the data payload for the IP datagram?
What information needs to be in the destination MAC address when sending from Router Y to Router Z?
What information needs to be in the destination MAC address when sending from Router Y to Router Z?
What's the first step that Router Z does after receiving the Ethernet frame?
What's the first step that Router Z does after receiving the Ethernet frame?
If the TTL value was set to 64 at the beginning, what is the value of the TTL once it reaches its destination?
If the TTL value was set to 64 at the beginning, what is the value of the TTL once it reaches its destination?
What information for the fourth TCP segment of data is relevant when Computer 1 sends a request to Computer 2 on port 80?
What information for the fourth TCP segment of data is relevant when Computer 1 sends a request to Computer 2 on port 80?
Which of the following has the correct IP datagram information for Computer 1 on network B sending to Computer 2?
Which of the following has the correct IP datagram information for Computer 1 on network B sending to Computer 2?
When referring to RJ45, we are referring to ________.
When referring to RJ45, we are referring to ________.
What information is Computer 1 looking at in the ARP table on Router Y?
What information is Computer 1 looking at in the ARP table on Router Y?
Which layer constructs the IP datagram?
Which layer constructs the IP datagram?
What information is in the payload section of the TCP segments?
What information is in the payload section of the TCP segments?
What information needs to be in the destination MAC address when sending from computer 1 to its gateway?
What information needs to be in the destination MAC address when sending from computer 1 to its gateway?
What's the second step that Router Z does after receiving the Ethernet frame?
What's the second step that Router Z does after receiving the Ethernet frame?
If the TTL value was set to 64 at the beginning for Computer 1, what is the value of the TTL once it reaches its destination?
If the TTL value was set to 64 at the beginning for Computer 1, what is the value of the TTL once it reaches its destination?
What information for the first TCP segment is correct when Computer 1 sends FTP request to Computer 2?
What information for the first TCP segment is correct when Computer 1 sends FTP request to Computer 2?
Which of the following has the correct IP datagram information for Computer 1 on network B sending to Computer 2?
Which of the following has the correct IP datagram information for Computer 1 on network B sending to Computer 2?
Flashcards
Data Link Layer Function
Data Link Layer Function
The Data Link Layer is responsible for building the Ethernet frame.
Network Layer Function
Network Layer Function
The Network Layer constructs the IP datagram to ensure correct packet delivery across networks.
TCP Segment
TCP Segment
Contains application data inside the IP datagram.
Packet destination to Router Z
Packet destination to Router Z
To send packets to Router Z, the Ethernet datagram needs Router Z's MAC address.
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Communication with Router Y
Communication with Router Y
When communicating with Router Y, Computer 1 uses Router Y's MAC address in the Ethernet datagram.
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Source Port
Source Port
In FTP communication, this identifies the source port on the initiating machine.
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Destination Port
Destination Port
In FTP communication, port 21 is commonly the port on the destination server.
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Source and destination ports.
Source and destination ports.
Guarantees proper routing of web server requests to their handling processes on web server.
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Ethernet Frame Checksum
Ethernet Frame Checksum
Router Z calculates a checksum to check if the frame's data is the same as the header's checksum.
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IP Datagram Version
IP Datagram Version
Indicates the IP protocol version used (IPv4).
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Minimum Header Length
Minimum Header Length
Specifies the size in bytes of the IP header (typically 20 bytes if no options are set).
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Source IP Address
Source IP Address
The IP address of the sending device
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Destination IP Address
Destination IP Address
The IP address of the destination device.
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RJ45
RJ45
RJ45 refers to the cable plug used for Ethernet connections.
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Network Addressing
- Computer 1 on Network B (IP: 192.168.1.233) targets Computer 2 (IP: 10.1.1.205) located on a different network than its own.
- Computer 1 on Network C (IP: 172.16.1.57) aims to communicate with Computer 2 (IP: 172.16.1.133), with a Time to Live (TTL) value remaining unchanged at 64 upon arrival.
ARP Messaging
- Sending a broadcast ARP message (FF:FF:FF:FF:FF) allows Computer 1 to gather network node information; not exclusively to acquire the MAC address of Computer 2.
- Computer 1 checks the ARP table of Router Y for the corresponding MAC address of the desired IP address.
Layer Functions
- The Data Link Layer is responsible for constructing the Ethernet frame.
- The Network Layer constructs the IP datagram, ensuring correct packet delivery.
- The payload of the IP datagram typically contains the TCP segment, which includes important application data.
Packet Destination
- To send packets to Router Z, the Ethernet datagram requires Router Z's MAC address as the destination.
- When communicating with Router Y, Computer 1 must use Router Y's MAC address in the Ethernet datagram.
TCP Segment Information
- For FTP communication initiated by Computer 1 on network A, the TCP segment information includes:
- Source Port: 21086
- Destination Port: 21
- Sequence Number: 1
- Acknowledgment Number: 2
- In web server requests, specifying the correct source and destination ports ensures proper routing on the target machine.
Ethernet Frame Reception Process
- Upon receiving an Ethernet frame, Router Z first calculates a checksum to verify the frame's integrity against the header's checksum.
IP Datagram Fields
- Critical fields in the IP datagram for Computer 1 on Network B targeting Computer 2 include:
- Version: 4
- Minimum Header Length: 20
- Source IP Address: 192.168.1.121
- Destination IP Address: 172.16.1.57
RJ45 Reference
- RJ45 refers specifically to the cable plug, a crucial connector in Ethernet networking.
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